On networks allowing nick registration (for example libera), channels can have +r flag, which allows to join only registered nick. The bot tries to join channels immediately after successful connection, which sometimes happens before it's identified by NickServ, so the join fails.
On networks allowing nick registration (for example libera), channels can have
+rflag, which allows to join only registered nick. The bot tries to join channels immediately after successful connection, which sometimes happens before it's identified by NickServ, so the join fails.